1. The method of buried tracer wire is direct connection method, which has high signal-to-noise ratio, less interference, easy detection, and accurate and reliable detection results.

2. The PE pipeline tracer wire in the urban area should not be detected by the induction method. The pipelines in the urban area are dense, while the tracer wire is relatively small, and its grounding circuit resistance is generally much larger than that of other pipelines, so the induced current signal generated is often much weaker than that of non-target pipelines, and the tracer wire signal is easy to be covered up, resulting in mismeasurement.

3. When detecting the trace line of the short branch pipeline, the signal point should be selected at the end of the branch trace line (i.e. at the test pile), so that the signal on the branch trace line is strong and the branch point will not be missed.

4. When using the direct connection method to bury the tracer wire, try to choose a lower working frequency, and try not to cross connect the transmitter's ground wire to other pipelines to reduce signal induction or crosstalk to other pipelines.

5. During detection, the position of power supply point shall be changed according to the actual situation, and then the detection shall be repeated to check the coincidence of the two detection results, so as to improve the accuracy and accuracy of detection.

6. For PE pipes laid by directional drilling, due to the large buried depth of the tracer wire (which may be greater than 5m), in addition to selecting a lower working frequency to reduce the induction of electromagnetic field to other pipelines, we should also try to improve the grounding conditions, increase the power supply current on the tracer wire, and improve the signal-to-noise ratio, so as to obtain better detection results.

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